I think the support lines showed that even if the whales or anyone else wants to drop the bitcoin it will take considerable amount of more money than it would require to get it higher. Now think you are a financial wizard who makes money in any case and have a lot of money and considered a whale, which one would you prefer, spend more money and profit a lot less to drop bitcoin or spend a lot less money but make a lot more money by helping it go up?

Obviously, all people realized bitcoin can be dropped only to a certain point and can't be dropped any further and after that trial and error they went with the bulls and they bought a lot of coins from the support line and some even sold at the resistance line to take their profits. It will continue to go up as long as it worth a lot more to whales.